In the room where the AP would be is a Virgin Media V6 TV box. I have some questions about how to best connect this lot together.

If I connect the AP to the gigaswitch, rather than directly into the router, will there be a degradation in the wireless bandwith?

Assuming this is an AC2100 system, so 300 Mbit link rate on 2.4 GHz and 1.76 Gb link rate on 5 GHz, you can calculate with some average real-world data rates of 150...170 Mbit on 2.4 GHz and some 500...600 Mbit for 5 GHz. Still plenty of bandwidth for FullHD and 4K streams on wired.

Re: Connectivity of a gigaswitch and an Access Point

Still not a model number there are many "AC1200" class devices - WAC104 (no v2)? WAC120 (no v2)? EX6150 v2? Or any router with optional AP mode like R6xxx?

The WAC120 or the EX listed have only one GbE port, the WAC104 has for GbE ports. The Nighthawk routers - some only allow using one port for GbE uplink, other have poolry performing GbE "swith" ports (in fact software bridges and lack of hardware acceleration support).

Re: Connectivity of a gigaswitch and an Access Point

Thanks Schumaku. Do I understand you correctly, then, that the ethernet ports on the WAC104 are not good enough to support fast connection for the TV box> Also, am I right in understanding that the WAC104 is better connected directly to the router than the gigabit sitch?